Chopper knife



FIG. 1. Is a perspective view of our chopper knife;

FIG. 2. Is a front view thereof;

FIG. 3. Is a right side elevational view thereof;

FIG. 4. Is a rear view thereof;

FIG. 5. Is a left side elevational view thereof;

FIG. 6. Is a top view thereof; and,

FIG. 7. Is a bottom view thereof. 

The ornamental design for a chopper knife, as shown and described. 